jonasschneider

import numpy
from numpy import argsort, mean, std

def sample_norm(mu, sigma):
  return numpy.random.normal(loc=mu, scale=sigma)

def sample_norm_vec(mu, sigma, len):
  return [sample_norm(mu, sigma) for i in range(0, len)]

def cem(f, mu0, sigma0, n_iter, n_samples, p_elite, noise_amount):

jonasschneider

extern crate tls;
extern crate byteorder;
extern crate openssl;

extern crate crypto;

use std::fs::File;
use std::io::{Read,Write,Cursor};
use std::net::TcpListener;

jonasschneider

extern crate tls;
extern crate byteorder;
extern crate openssl;

extern crate crypto;

use std::fs::File;
use std::io::{Read,Write,Cursor};
use std::net::TcpListener;

jonasschneider

EXPLAIN UPDATE participants dest_participants SET seqno = 
    (SELECT n FROM
        (SELECT participants.id id, row_number() OVER (PARTITION BY projects.account_id ORDER BY participants.id) n
         FROM participants JOIN projects ON participants.project_id=projects.id)
    t WHERE t.id=dest_participants.id)
WHERE dest_participants.seqno IS NULL;

                                               QUERY PLAN
---------------------------------------------------------------------------------------------------------
 Update on participants dest_participants  (cost=0.00..6895397.53 rows=438 width=336)

jonasschneider

The following test case illustrates an unexpected behaviour of of Ruby's Kernel#exec call caused by platform differences between OS X and Linux.

In both tests, a program is spawned that simply prints all the process IDs of its ancestors. From this list, the list of the ancestors of the test process is substracted, so the list only contains ancestors added by the exec invocation.

In the first test, the comand line /path/to/program is Kernel#exec'd. This works on both platforms. However, the second test tries to exec the command line '/path/to/program' (note the quotes). This leads to a platform difference: while on OS X, just one new ancestor is created, Linux creates two.

The root cause is likely an implementation difference between OS X's and Linux's sh program. Even if you just give it a single absolute path to an executable file, Ruby will always spawn a subshell if you pass just one argument to Kernel#exec. Both shells, if given an exact absolute path, will directly exec(2) (or whatever

jonasschneider

[http-bio-8080-exec-7] ERROR spark.webserver.MatcherFilter -
java.lang.NullPointerException
	at edu.kit.ipd.creativecrowd.persistentmodel.PersistentAnswer.equals(PersistentAnswer.java:156)
	at edu.kit.ipd.creativecrowd.operations.SubmitAssignmentTransaction.run(SubmitAssignmentTransaction.java:54)
	at edu.kit.ipd.creativecrowd.connector.Connector.submit(Connector.java:188)
	at edu.kit.ipd.creativecrowd.controller.AssignmentController.update(AssignmentController.java:124)
	at edu.kit.ipd.creativecrowd.router.Router.lambda$10(Router.java:89)
	at edu.kit.ipd.creativecrowd.router.Router$$Lambda$11/881848365.handle(Unknown Source)
	at spark.SparkBase$1.handle(SparkBase.java:264)
	at spark.webserver.MatcherFilter.doFilter(MatcherFilter.java:154)

jonasschneider

ubuntu@ip-172-31-15-61:~$ sudo jdb -connect sun.jvm.hotspot.jdi.SAPIDAttachingConnector:pid=5996
Initializing jdb ...
> threads
Group system:
  (java.lang.ref.Reference$ReferenceHandler)0xd0                                              Reference Handler                                      cond. waiting
  (java.lang.ref.Finalizer$FinalizerThread)0xcf                                               Finalizer                                              cond. waiting
  (java.lang.Thread)0xcd                                                                      Signal Dispatcher                                      running
  (sun.misc.GC$Daemon)0xcc                                                                    GC Daemon                                              cond. waiting
Group main:
  (java.lang.Thread)0xd1                                                                      main                                                   running

jonasschneider

$ sudo gdb --batch --pid 4899 -ex "print /s ptsname(12)"
0x00007fb15b9faf20 in __nanosleep_nocancel () at ../sysdeps/unix/syscall-template.S:81
81  ../sysdeps/unix/syscall-template.S: No such file or directory.
$1 = 0x7fb15bcfd9d0 <buffer> "/dev/pts/44"

$ test/scripts/uml-ptsname /proc/4899/fd/12
/dev/pts/45

$ cat test/scripts/uml-ptsname
#!/usr/bin/python

jonasschneider

void digitalWrite(const uint8_t pin, const uint8_t val) {

}

uint8_t digitalRead(const uint8_t pin) {
  return 0;
}

jonasschneider

/**
  ******************************************************************************
  * @file    system_stm32f4xx.h
  * @author  MCD Application Team
  * @version V2.3.0
  * @date    02-March-2015
  * @brief   CMSIS Cortex-M4 Device System Source File for STM32F4xx devices.       
  ******************************************************************************  
  * @attention
  *